Honda WB20XT2 Manual page 42

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WB20XT2•WB30XT2
ENGINE WON'T START
• Check the oil level before troubleshooting (page 3-3).
Loosen the carburetor drain screw and check the
fuel flow from the fuel tank (page 6-3).
Fuel
Perform the spark test (page 8-8).
Spark
Check the cylinder compression (page 12-5).
Check the spark plug (page 3-5).
Dry
Disassemble the carburetor to clean the
carburetor parts, jets and nozzles
(page 6-7, 6-8).
Check for clogged fuel tank joint or fuel tube
No fuel
(page 3-9, 3-10).
Perform the IGNITION SYSTEM
No spark
TROUBLESHOOTING (page 8-2).
Compression
Check the valve clearance (page 3-7) and then
is too high
perform the cylinder compression test. If the
cylinder compression is too high, remove carbon
deposits in the combustion chamber (page 3-9).
Check the decompressor operation of the
camshaft (page 13-12).
Check the valve clearance (page 3-7), and then
perform the cylinder compression test.
If the cylinder compression is too low, perform a
leak down test.
If the leak down test reveals excessive leakage
into the crankcase, inspect the piston, cylinder,
Compression
and rings for wear.
is too low
If the test reveals leakage out the intake port,
inspect the intake valve for proper sealing.
If the test reveals leakage out the exhaust port,
inspect the exhaust valve for proper sealing.
If spark plug is correct, clean and dry the
electrodes and then restart the engine, taking
Wet
care that the choke valve is not closed too much.
If the engine does not start and the electrodes are
wet again, check the carburetor float valve
(page 6-8).
TROUBLESHOOTING
4-3